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(No Model.) 2 Sheets-Sheet 1.

J. VANDEROAR.

SAFETY VALVE.

No. 301,938. Patented July 15, 1884.

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(No Model.) 2 Sheets-Sheet 2.

' J. VANDEROAR SAFETY VALVE.

No. 301,938. Patented July 15,1884.

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UNITED STATES PATENT OFFICE.

JOHN VANDERGAR, OF WEST TROY, NEW YORK, ASSIGNOR TO ROBERT F.

SILLIMAN, OF SAME PLACE;

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 301,938, dated July 15,1884.

Application filed December 31, 1883. (No model.)

To all whom, it may concern.-

Be it known that I, JOHN VANDEROAR, of WVcst Troy, county of Albany, andState of New York, have invented a new and useful Improvement in SafetyValves; and I do hereby declare that the following is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use it, refer- IO ence beinghad to the accompanying drawings,

forming a part thereof.

My invention relates to improvements in steam safety-valves in which thevalve and valve-weights are incascd; and the objects of I 5 my inventionare, first, to keep the valve closed by a direct and unvarying pressure;second, to prevent the weights upon the pressure-rod being increased ordiminished at will; third, to keep the valve clean and free from dirtand dust. I attain these objects by the mechanism shown in theaccompanying drawings, in which- Figure 1 is a side elevation showingthe steam-duct to the valve. Fig. 2 is a plan 2 view showingperforations in top of casing. Fig. 3 is a detail of valve-seat. Fig. 4is a sectional elevation of my invention.

The steam is directed by means of the duct Ato the valve B in thevalve-seat O, which is a cylindrical flanged piece, the flange C forminga seat for the casing D, as shown in drawings, Fig. 4. Upon the valveare piled the weights, held in position by means of therod F, whichmoves in the guide G in the valve- 5 seat, and the guide H, forming apart of the casing D. The casing,.which is cylindrical in shape, isseated upon the flange O, and is attached to the valve-seat by means ofscrews. Near the top of the cylinder are perforations to release thesteam. Outside of and inclosing the casing D is the casing E, which isalso cylindrical, the top being perforated, and the bottom flangedaround the lower edge to -receive the screw-bolts I. The bolts I arehead- 5 ed on the inside of the boiler, the threaded part protruding upthrough the flange of the casing, and upon this thread the nut isscrewed and then sealed by the inspector. This prevents tampering withor increasing the weights, because the seals have to be broken beforethe casing can be lifted. The seat is bolted to the boiler through theflange on the duct A, as shown in the drawings. Packing is placedbetween the seat and boiler and the boiler and flange, to preserve anair-tight joint.

In the side of the casing D and in the top of the casing E areperforations, as shown in the drawings. The perforations are placed inthis way in the top of i one casing and side of the other, to allow thesteam to escape, butnotto allow any impuritiesas sandto gain entrancetothe valve-seat. By this means, also, the engineer is prevented frominserting any long thin instrument to bear upon the weights, and thusincrease the weight upon the valve. The valve and weight are put on andcovered by the casings D and E,which are fastened to the boiler, asshown, and then the whole thing inspected. \Vhen the inspector is fullysatisfled, he places his stamp on the boltsI I,which then cannot beremoved without breaking the seal. Thus the seal acts as a detective.

Having thus fully described my invention, what I claim, and desire tosecure byLetters Patent, is-

1. In a safety;valve, the casings D and E,- having perforations in theirside and top, respectively, substantially as and for the purpose setforth and described.

. 2. The combination of the steam-duct A, the valve-seat O, the valve13, and the casing D, substantially as set forth and described.

In testimony that I claim the foregoing I append my signature.

JOHN VANDERCAR.

Witnesses GEO. H. MORRISON, T. T. TRIMBLE.

